Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December comes with a shift in the average high-temperature, falling from a refreshing 15.4°C (59.7°F) in November to a chilly 9.6°C (49.3°F). A consistent average low-temperature of 4.9°C (40.8°F), with a minor variance from the daytime highs, is noted during the nights of December.Humidity
In December, the average relative humidity in Iwakuni is 76%.Rainfall
In Iwakuni, during December, the rain falls for 14.3 days and regularly aggregates up to 40mm (1.57") of precipitation. In Iwakuni, during the entire year, the rain falls for 161.2 days and collects up to 650mm (25.59") of precipitation.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows in Iwakuni. Throughout December, in the average 2.5 snowfall days, it receives 9mm (0.35") of snow. In Iwakuni, during the entire year, snow falls for 10.4 days and aggregates up to 29mm (1.14") of snow.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 06:58 and sunset at 17:01. On the last day of December, sunrise is at 07:16 and sunset at 17:11 JST.
Sunshine
The average sunshine in December in Iwakuni is 5.3h.UV index
The months with the lowest UV index in Iwakuni are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, a regular UV index of 2 translates into these guidelines:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Frequently asked questions
What are December temperatures in Iwakuni?
What is the average humidity in December in Iwakuni?
How much does it rain in Iwakuni in December?
When does it start snowing in Iwakuni?
What is the month with the shortest days in Iwakuni?
How many hours of daylight does Iwakuni have in December?
What time are sunrise and sunset in December in Iwakuni?
How many hours of sunshine does Iwakuni have in December?
What are the months with the lowest UV index in Iwakuni?
What is the UV index reading in December in Iwakuni?
Average temperature in December
Iwakuni, Japan
- Average high temperature in December: 9.6°C
The warmest month (with the highest average high temperature) is August (29.2°C).
The month with the lowest average high temperature is January (7.6°C).
- Average low temperature in December: 4.9°C
The month with the highest average low temperature is August (23.4°C).
The coldest month (with the lowest average low temperature) is January (2.8°C).
Average pressure in December
Iwakuni, Japan
- Average pressure in December: 1020.8mbar
The month with the highest atmospheric pressure is January (1021.2mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).
Average wind speed in December
Iwakuni, Japan
- Average wind speed in December: 11.3km/h
The windiest month (with the highest average wind speed) is January (11.8km/h).
The calmest month (with the lowest average wind speed) is June (6.7km/h).
Average humidity in December
Iwakuni, Japan
- Average humidity in December: 76%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is March (73%).
Average rainfall in December
Iwakuni, Japan
- Average rainfall in December: 40mm
The wettest month (with the highest rainfall) is July (137mm).
The driest month (with the least rainfall) is November (24mm).
Average rainfall days in December
Iwakuni, Japan
- Average rainfall days in December: 14.3 days
The month with the highest number of rainy days is July (20 days).
The month with the least rainy days is October (9.7 days).
Average snowfall in December
Iwakuni, Japan
- Average snowfall in December: 9mm
The month with the highest snowfall is January (13mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Iwakuni, Japan
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Iwakuni, Japan
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in December
Iwakuni, Japan
- Average sunshine days in December: 12.9 days
The month with the most sunshine days is May (19 days).
The month with the least sunshine days is July (8.8 days).
Average UV index in December
Iwakuni, Japan
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Iwakuni, Japan
- Average cloud cover in December: 41
The months with the most cloud cover are January and June (Cloud cover 43).
The months with the least cloud cover are August and October (Cloud cover 31).
Average visibility in December
Iwakuni, Japan
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, September, October, November and December (10km).
The month with the lowest visibility is July (8km).
Iwakuni, Japan
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